The business card is composed of a 0.6mm thick PCB in the standard business card size (3.5"x2"), along with a NT3H1201 NFC IC, an LED, NFC antenna, and a few support components. This means that every time you scan it, the LED will light up, magically harvesting power from the device that's scanning it. Stores up to 2kb of data.
This listing includes 5 cards, with a customizable front and back.
A business card which is also a cell phone that is programmed to call the person on the card. This is really cool.
This company makes custom business cards out of metal. Even lockpick ones.
A service that will print high-quality stickers, business cards, and what have you out of images that you send to them. Their prices are quite reasonable, also.